Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Hi. My 320 has the logic 7 system in it and I would like to install an amp and a couple of subs in the trunk. I've been browsing for days in different forums trying to find a good solution and your harness seem to be the best solution there is. Clean and doesn't tamper with or damage the original system.

Trying to sort out an upgrade path. I have a 2011 X5M with Enhanced Premium Sound (option 672). Preference would be to upgrade to front and rear Morel component sets, possible earthquake sws8 under seats, JL audio subs in cargo being driven by MS-8 through 8 channels of amplification from three aftermarket amps. I would also prefer to try to get low level RCA signal from head unit to feed MS-8 with thought being the less components in the signal path, the better. What are my harness options?

Trying to sort out an upgrade path. I have a 2011 X5M with Enhanced Premium Sound (option 672). Preference would be to upgrade to front and rear Morel component sets, possible earthquake sws8 under seats, JL audio subs in cargo being driven by MS-8 through 8 channels of amplification from three aftermarket amps. I would also prefer to try to get low level RCA signal from head unit to feed MS-8 with thought being the less components in the signal path, the better. What are my harness options?

Hi, I cannot pm anyone yet because I just made my account, I bought a 2008 335i yesterday and it has the logic7 system, I want to buy one of these pnp harnesses asap, but cannot pm you, my email is 18000rpms@gmail.com, i have paypal ready please let me know where to send payment

Do anybody know the BMW-part-nr or TYCO-nr of the 2-pin power-connector on amplifier ?

Amplifiers before 09/2009 where powered via pin 10/20 of the 20-pin-connector and from 09/2009 with this 2-pin power-connector as load-part and for the logic-part on the small pin 1 in the FO-Housing.
BR sausewind

Do anybody know the BMW-part-nr or TYCO-nr of the 2-pin power-connector on amplifier ?

Amplifiers before 09/2009 where powered via pin 10/20 of the 20-pin-connector and from 09/2009 with this 2-pin power-connector as load-part and for the logic-part on the small pin 1 in the FO-Housing.
BR sausewind

The Premium OEM amp with the separate 12V/ground connections (from the standard 20-pin) changed the topology of the outputs voltage in a way that makes the standard signal sensing circuits remote trigger unreliable when those outputs are tapped.

So it is useless to tap those outputs so a signal sensing circuit generate a remote turn on signal. It will not do it most of the time unless the volume is cranked up beyond acceptable.

The Logic7 harness/LOC still will convert the woofer level outputs to low level, but the remote turn on signal will have to be tapped from another source -pin 13 in the back of the iDrive unit or the thin black wire located behind the right corner of the rear seat cushion, for example.

Did any of these modification effect your bluetooth or navigation? The reason I'm asking is that I just purchased a 06 750Li and the previous owner installed an Alpine amp in the trunk (powers all inside speakers - no aftermarket sub). When I make a call or try to use my navigation I cannot hear any sound. Does installing an amp cause the blue tooth not to work?

Did any of these modification effect your bluetooth or navigation? The reason I'm asking is that I just purchased a 06 750Li and the previous owner installed an Alpine amp in the trunk (powers all inside speakers - no aftermarket sub). When I make a call or try to use my navigation I cannot hear any sound. Does installing an amp cause the blue tooth not to work?

You need to take your car to an audio shop to determine where the wiring problem is at your OEM amp.

Technic, PM sent, need kit sent to 85339. Also, sorry if this is already answered in an earlier post, which amp/sub combo do you recommend for big bass and clean install.? I want to power interior speakers, subs, and aftermarket subs. Thanks

Technic, PM sent, need kit sent to 85339. Also, sorry if this is already answered in an earlier post, which amp/sub combo do you recommend for big bass and clean install.? I want to power interior speakers, subs, and aftermarket subs. Thanks

If this is a Logic7 system -MOST fiber optics- then my harness will not work. You will need either to code your OEM iDrive unit to output Stereo (high level outputs), replace/fix your Logic7 OEM amp, or replace you OEM amp with a mObridge DA2 MOST to analog outputs converter.

Then you can use the harness to wire your aftermarket amp outputs to the OEM speaker wires without cutting/tapping/splicing them. Otherwise it will not work.